A very large, bright white light passed over the sky heading northwest to southeast. It was a consistent bright ultra white light that traveled at a very consistent speed. There were no flashing markers, and absolutely no sound at all. I could compare it against other aircraft in the sky but it did not act like any commercial airplane. The duration took about 3 minutes to travel across the sky until I lost it to the trees so not horizon to horizon. Maybe a satellite or an airplane?